Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thanh phan » thanh pho, thanh san, thanh toan
quang pho » quang cao, quang hoi, quang hoc
dung cong » dung trong
tac thanh » bac thanh, cac thanh, tcc thanh
doc hieu » toc thieu, hoc thieu, hoc hien
xung phi » dung phu, ung pho
cong tac » cong ty

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu nganh - thanh ((xung phi) or (quang pho)) dung cong tac thanh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - thanh ((xung phi) OR (quang pho)) dung cong tac thanh phan*.